#include<bits/stdc++.h>
using namespace std;
int N;
char c[10],d[10];
int main(){
	
	while(scanf("%s %s",c,d)!=EOF){
		int t1=(c[3]-'0')*10+c[4]-'0';
		int t2=(d[3]-'0')*10+d[4]-'0';
		if(t1==0) t1=60;
		if(t2==0) t2=60;
//		cout<<c<<d<<" ";
		int cnt=0; 
		if(t1>=30&&t1<=40){
			if(t2>=30&&t2<=40){
				cnt+=(t2-t1)*100;
			}
			if(t2>=40&&t2<=50){
				cnt+=(40-t1)*100;
				cnt+=(t2-40)*150;
			}
			if(t2>=50&&t2<=60){
				cnt+=(40-t1)*100+10*150;
				cnt+=(t2-50)*50;
			}
		}
		if(t1>=40&&t1<=50){
			if(t2>=40&&t2<=50){
				cnt+=(t2-t1)*150;
			}
			if(t2>=50&&t2<=60){
				cnt+=(50-t1)*150;
				cnt+=(t2-50)*50;
			}
	}
	if(t1>=50&&t1<=60){
		cnt+=(t2-t1)*50;
	}
	
	cout<<cnt<<endl;}
	return 0;
}
